Intersection Observer v2 delay and trackVisibility properties missing in Browser compatibility and are not described - plus no support in Firefox?

[BearCooder]

I cannot find information about the Intersection Observer v2 on MDN if it is supported - especially the properties delay and trackVisibility. A search with different keywords on google for mdn and in the mdn searchbox shows nothing. And in all the Browser compatibility boxes connected with Intersection Observer I did not find those two properties.

The IntersectionObserver constructor now takes two additional configuration properties: delay and trackVisibility. The delay is a number indicating the minimum delay in milliseconds between notifications from the observer for a given target. The trackVisibility is a boolean indicating whether the observer will track changes in a target's visibility. Source and spec

I did a quick code test and it seems that Firefox does really not support these two properties. It worked on Chrome but on Firefox not.

[teoli2003]

I searched Bugzilla and found nothing. I think we can safely assume this is Chrome-only for the time being.

[BearCooder]

sadface :(
But it would be still good to include in the MDN documentation + Browser support table I think? :)

[teoli2003]

If it is supported by a browser (Chrome, for example), of course. PR(s) welcome.